tibbitts



(No Model.) 2 Sheets-Sheet 1,

I. R. TIBBITTS, W. A. MADISON & G. J. ALLEN. FURNACE GRATE FOR STEAMBOILERS.

GOOGOOOQOOOGG OOCDOOOOOGOGO OOOOGOOOOOO OOOOOOQOOGGO OOOOOOOOO OOOOOOOC)()OOOO k Fig. 1.

. W I 291491777018. %%aq @2 I a .23, %M% f .xflZ/u UNITED STATES PATENTOrricn,

FRANK R. TIBBITTS, \VILLIAM A. MADISON, AND CHARLES JQALLEN, OFCLEVELAND, OHIO, ASSIGNORS TO THE PLAYFORD ST OKER COMPANY,

or saint PLACE.

FU RNACE-G RATE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 561,627, dated June 9,1896.

Application filed February 10, 1896. Serial No- 578,813- (lilo model.) I

To all 1071 0722, it may concern.-

Be it known that we, FRANK R. Tresrrrs, WILLIAM A. Emerson, and CHARLESJ. AL- LEN, citizens of the United States, residing at Cleveland, in thecounty of Ouyahoga and State of Ohio, have invented certain new anduseful Improvements in Furnace-Grates for Steam-Boilers, of which thefollowing is a specification.

This invention relates to f urnace-gratcs for steam-boilers, and theclass to which it belongs is that of traveling grates; and theimprovements consist, first, in the peculiar construction and adaptationof the grate-carriage, whereby two or more rows of grate-bars arecarried by simply increasing the width of the carriage withoutadditional leg-supports, thus providing ample space for the under backtravel of the grates; second, in the peculiar construction andapplication of the grate-bars, whereby the bars are made interchangeableor reversible and are quickly and readily removed and replaced, each barbe ing so constructed that it requires but one bolt to fasten it, theobjects of the invention being to simplify and facilitate theconstruction and application of such grates.

In the accompanying drawings, Figure l is a cross-section of thecarriage and boiler-setting on the line of the front shaft, showing theconstruction and arrangement of the grate-bars and their middle support.Fig. 2 is a longitudinal section of the grate-carriage on line 2 9 ofFig. 1, showing the middle grate and link supportiug bar. Fig. 3 is atopview of the front end of the grates, showing the arrangement of theinner or abutting ends of the grate-bars, their means of attachment andsupport. Fig. 4 is a top view of one of the inner links. Fig. 5 is anend view of said link. 6 is a top view of one end of a grate bar. Fig. 7is a side view of the same, showing the attaching-hook. Fig. 8 is a seciional view of the same, showing the method of attaching the inner orhook ends of the grate-bars to the links.

A A represent the two side frames of the grate-carriage. B B areintermediate crossbeams bolted to and joining said side frames.

C- C are shafts having their bearings in the top corners of the sideframes, the forward shaft extending through the side plates of the frontof the boiler-setting, on one end of which power is to be applied foroperating the grates.

E E are sprocket-wheels fixed on the shafts for carrying the grates. Twoof said sprocket wheels are placed on the middle part of the shafts, sothat two rows of grate-bars may be employed, the object beiu g to useshort bars to avoid warping.

G is a central yoke-bar having eyes in each end, through which theshafts pass, but is not supported thereon, as the said bar rests uponthe intermediate cross-beams B B. The ends of the bar G are locatedbetween the middle sprockets E E on the shafts and serve as a supportfor the middle chain-links in the travel of the grates from the front tothe rear of the carriage.

Bearing-plates F F are attached to the bar G as Well as to the side barsA A of the carriage-frame to provide a raised track or sur- 7 face on alevel with the tops of the sprockets for the links of the chains toslide upon.

The links H H of the inside chains are provided with curved sockets ormortises I, and the inner ends of the grate-bars are provided withquadrant pins J, which are inserted into said inortises for holding theinner ends of the grate-bars to the links, as illustrated in Figs. 4, 5,6, 7, and 8. and quick means of attaching the inner ends of thegratebars, which is performed by holdin g the grate-bar in aperpendicular position, as seen in dotted lines in Fig. 8, for insertingthe point of the hook into the m ortise, and then turning the bar downin the horizontal position, thereby completely inserting the hook. Nowthe outer end of the bar thus placed is secured to the outer chain-linksby a single bolt.

From the foregoing it will be seen that two or more rows of grate'barsmay be applied to and operated on a carriage-frame having only fourlegs, and that the grate-bars may be very quickly and easily attached orremoved by the use of a single bolt for each bar, thus enabling quickreplacement of bars for repairs, die.

This makes a simple Having described our invention, we claim as follows:

1. In endless traveling grates for furnaces, the combination withcarriage A having crossbeams B B, a central yoke-bar G supported on saidcross-beams and having eyes in each end through which the shafts C pass,of two or more rows of grate-bars supported on the chain-links H II, theadjacent inner ends of the grate-bars and chain-links supported andsliding on the yoke-bars G, substantially as described.

2. The links H H having curved mortises I, the grate-bars having thequadrant pins J, adapted for securing one end of the grate- I 5 bars tothe chain-links, substantially as and for the purpose set forth.

FRANK R. TIBBITTS. WILLIAM A. MADISON. CHARLES J. ALLEN.

Witnesses GEO. W. TIBBITTS, MAX P. GOODMAN.

